Duodenal ObstructionMesenteric ArteriesMesenteric Artery, SuperiorMesenteric Artery, InferiorArteriesDuodenal NeoplasmsSuperior Mesenteric Artery SyndromeMesenteric Vascular OcclusionCeliac ArteryPulmonary ArteryDuodenal DiseasesRenal ArteryCerebral ArteriesVasodilationMuscle, Smooth, VascularCarotid ArteriesVasoconstrictionSplanchnic CirculationFemoral ArteryBasilar ArteryIntestine, SmallMesenteric VeinsBiological FactorsVasoconstrictor AgentsVasodilator AgentsJejunumRats, WistarDuodenostomyIliac ArteryBrunner GlandsSplenic ArteryEndothelium, VascularNorepinephrineMuscle RelaxationMuscle ContractionRats, Sprague-DawleyStomachCoronary Artery BypassVertebral ArteryHepatic ArteryIntestinal MucosaPhenylephrineAcetylcholineTomography, X-Ray ComputedIntestinesRadial ArteryMyographyDose-Response Relationship, DrugMammary ArteriesDuodenoscopyTime FactorsCarotid Artery, InternalIleumSubclavian ArteryAngiographyDogsRats, Inbred WKYGastrointestinal MotilityNitric OxideCarotid Artery DiseasesCoronary VesselsBlood PressureTreatment OutcomeDuodenitisBrachial ArterySuperior ColliculiVena Cava, SuperiorRabbitsEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonAneurysmRegional Blood FlowPancreasRats, Inbred SHRPancreaticoduodenectomyIntestinal AbsorptionRenal Artery ObstructionPylorusOphthalmic ArteryPotassium ChlorideStentsSwineCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidPyloric AntrumDigestive SystemIndomethacinNG-Nitroarginine Methyl EsterArterial Occlusive DiseasesConstriction, PathologicCalciumMiddle Cerebral ArteryUmbilical ArteriesThoracic ArteriesEnzyme InhibitorsApaminElectric StimulationNitric Oxide SynthaseMyoelectric Complex, MigratingDigestion